表单字段的Python Django PDF展平 [英] Python Django PDF Flattening of Form Fields
问题描述
我有一个项目，我需要填写预制的PDF，而要实现这一目标，我想到的最合乎逻辑的解决方案是将预制的PDF制成PDF表单，因此应该有一些标签，其中的输入值应该然后，我可以浏览PDF中的表单标签，并将它们与值字典对齐.
I have a project where I need to fill out pre-made PDFs and the most logical solution that comes to mind to accomplish this is to make the pre-made PDFs into PDF forms so there are tags where input values are supposed to go, then I can look through the form tags in the PDF and line them up with a dictionary of values.
我已经使用 PyPDF2 完成了此任务.总的来说，我拍摄了一个Web表单的图像，然后打开Acrobat并根据图像中看到的字段创建了一个PDF表单，然后使用 PyPDF2 填写了PDF表单字段，但需要注意的是在某些浏览器中，打印那些填充值似乎是错误的，其中Firefox是其中之一.
I have accomplished this using PyPDF2. Overall, I took an image of a web form and then opened Acrobat and created a PDF form based on the fields seen in the image, then used PyPDF2 for filling out the PDF form fields, but the caveat is that printing those filled in values seems buggy in some browsers, Firefox being one.
我如何才能将PDF表单转换为标准/平面PDF，这样我可以保留预先填充的值，但会丢失可编辑的字段(因为我认为这是问题所在)?
How do I got about converting my PDF-Form to a standard/flat PDF so I can keep the pre-populated values, but lose the editable fields (as I think this is the issue)?
from io import BytesIO
import PyPDF2
from django.http import HttpResponse
from PyPDF2.generic import BooleanObject, NameObject, IndirectObject
def pdf_view(request):
template = 'templates/template.pdf'
outfile = "templates/test.pdf"
input_stream = open(template, "rb")
pdf_reader = PyPDF2.PdfFileReader(input_stream, strict=False)
if "/AcroForm" in pdf_reader.trailer["/Root"]:
pdf_reader.trailer["/Root"]["/AcroForm"].update(
{NameObject("/NeedAppearances"): BooleanObject(True)})
pdf_writer = PyPDF2.PdfFileWriter()
set_need_appearances_writer(pdf_writer)
if "/AcroForm" in pdf_writer._root_object:
# Acro form is form field, set needs appearances to fix printing issues
pdf_writer._root_object["/AcroForm"].update(
{NameObject("/NeedAppearances"): BooleanObject(True)})
data_dict = {
'first_name': 'John',
'last_name': 'Smith',
'email': 'mail@mail.com',
'phone': '889-998-9967',
'company': 'Amazing Inc.',
'job_title': 'Dev',
'street': '123 Main Way',
'city': 'Johannesburg',
'state': 'New Mexico',
'zip': 96705,
'country': 'USA',
'topic': 'Who cares...'
}
pdf_writer.addPage(pdf_reader.getPage(0))
pdf_writer.updatePageFormFieldValues(pdf_writer.getPage(0), data_dict)
output_stream = BytesIO()
pdf_writer.write(output_stream)
# print(fill_in_pdf(template, data_dict).getvalue())
# fill_in_pdf(template, data_dict).getvalue()
response = HttpResponse(output_stream.getvalue(), content_type='application/pdf')
response['Content-Disposition'] = 'inline; filename="completed.pdf"'
input_stream.close()
return response
def set_need_appearances_writer(writer):
try:
catalog = writer._root_object
# get the AcroForm tree and add "/NeedAppearances attribute
if "/AcroForm" not in catalog:
writer._root_object.update({
NameObject("/AcroForm"): IndirectObject(len(writer._objects), 0, writer)})
need_appearances = NameObject("/NeedAppearances")
writer._root_object["/AcroForm"][need_appearances] = BooleanObject(True)
except Exception as e:
print('set_need_appearances_writer() catch : ', repr(e))
return writer
推荐答案
解决方案非常简单，如有疑问，请阅读文档(第552/978页):
The solution was super simple, read the docs when in doubt (page 552/978):
我要做的就是将字段标志的位位置更改为1，使字段变为ReadOnly，如下所示:
All I needed to do was change the bit position of the field flags to 1, making the field ReadOnly, like so:
from io import BytesIO
import PyPDF2
from django.http import HttpResponse
from PyPDF2.generic import BooleanObject, NameObject, IndirectObject, NumberObject
def pdf(request):
template = 'templates/template.pdf'
outfile = "templates/test.pdf"
input_stream = open(template, "rb")
pdf_reader = PyPDF2.PdfFileReader(input_stream, strict=False)
if "/AcroForm" in pdf_reader.trailer["/Root"]:
pdf_reader.trailer["/Root"]["/AcroForm"].update(
{NameObject("/NeedAppearances"): BooleanObject(True)})
pdf_writer = PyPDF2.PdfFileWriter()
set_need_appearances_writer(pdf_writer)
if "/AcroForm" in pdf_writer._root_object:
# Acro form is form field, set needs appearances to fix printing issues
pdf_writer._root_object["/AcroForm"].update(
{NameObject("/NeedAppearances"): BooleanObject(True)})
data_dict = {
'first_name': 'John\n',
'last_name': 'Smith\n',
'email': 'mail@mail.com\n',
'phone': '889-998-9967\n',
'company': 'Amazing Inc.\n',
'job_title': 'Dev\n',
'street': '123 Main Way\n',
'city': 'Johannesburg\n',
'state': 'New Mexico\n',
'zip': 96705,
'country': 'USA\n',
'topic': 'Who cares...\n'
}
pdf_writer.addPage(pdf_reader.getPage(0))
page = pdf_writer.getPage(0)
pdf_writer.updatePageFormFieldValues(page, data_dict)
for j in range(0, len(page['/Annots'])):
writer_annot = page['/Annots'][j].getObject()
for field in data_dict:
# -----------------------------------------------------BOOYAH!
if writer_annot.get('/T') == field:
writer_annot.update({
NameObject("/Ff"): NumberObject(1)
})
# -----------------------------------------------------
output_stream = BytesIO()
pdf_writer.write(output_stream)
response = HttpResponse(output_stream.getvalue(), content_type='application/pdf')
response['Content-Disposition'] = 'inline; filename="completed.pdf"'
input_stream.close()
return response
def set_need_appearances_writer(writer):
try:
catalog = writer._root_object
# get the AcroForm tree and add "/NeedAppearances attribute
if "/AcroForm" not in catalog:
writer._root_object.update({
NameObject("/AcroForm"): IndirectObject(len(writer._objects), 0, writer)})
need_appearances = NameObject("/NeedAppearances")
writer._root_object["/AcroForm"][need_appearances] = BooleanObject(True)
except Exception as e:
print('set_need_appearances_writer() catch : ', repr(e))
return writer
这篇关于表单字段的Python Django PDF展平的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
